代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="css/IE6.css"/> <title>无标题文档</title> <script type="text/javascript" language="javascript"> function setCss(){ //根据浏览器来选择CSS if (!window.XMLHttpRequest) { setActiveStyleSheet("IE6.css"); //IE6 }else if(window.ActiveXObject){ setActiveStyleSheet("IE7.css"); //IE7, 以及IE7+ } else { setActiveStyleSheet("other.css"); //Mozilla FireFox、Safari, etc. } } function setActiveStyleSheet(filename){ var path = document.getElementsByTagName("link")[0].href; document.getElementsByTagName("link")[0].href="css/"+filename; alert("css/"+filename); } window.onload=setCss; </script> </head> <body> asdasdasd<br /> </body> </html>